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<?php
// Для All in One SEO Pack:
$title = get_post_meta(get_the_ID(), '_aioseop_title', true);
$descripton = get_post_meta(get_the_ID(), '_aioseop_description', true);
?>

<?php
//Для Yoast SEO:
$title = get_post_meta(get_the_ID(), '_yoast_wpseo_title', true);
$descripton = get_post_meta(get_the_ID(), '_yoast_wpseo_metadesc', true);

$my_descr = get_post_meta($post->ID, "_yoast_wpseo_metadesc", true);
if ($my_descr){
echo  "$my_descr";
}
else echo  "Нет описания для данной страницы";